SEATTLE, Nov. 23 /PRNewswire-FirstCall/ -- In anticipation of the busy holiday travel season, Alaska Airlines and Horizon Air offer the following tips for stress-free travel:

- Check in online or at a kiosk. Passengers can check in online for domestic and international flights up to 24 hours before departure at alaskaair.com or horizonair.com. International passengers also can enter passport information online. Alaska and Horizon also provide more than 440 convenient check-in kiosks at airports and many off-site locations. Alaska Airlines Mileage Plan members earn 1,000 miles the first time they check in online or at an Alaska or Horizon kiosk. Passengers should leave ample time to check any luggage at the airport.

- Know the carry-on limits. All airlines allow one carry-on bag and one personal item, such as a briefcase, laptop or purse. Details on size limitations for carry-on items are available at alaskaair.com. Customers planning to transfer to flights on Alaska or other carriers must adhere to standard carry-on limits. Customers should always keep valuables with them on the aircraft.

- Properly label all luggage. Passengers should provide a clearly printed label on the outside and inside of each piece of luggage. Tags should include name, address, e-mail address, permanent phone number and a phone number at the passenger's destination.

- Be aware of new or increased fees.

Baggage: Alaska Airlines and Horizon Air charge $15 for a first checked bag, $25 for a second and $100 for a third. First class and Gold-level Alaska Airlines Mileage Plan members, and customers flying to or from Mexico City and Guadalajara, Mexico, may check two bags free of charge. Customers on flights within the state of Alaska may check three bags free of charge. Additionally, passengers boarding in Santa Rosa, Calif. can check one properly packaged box of wine free of charge. The charge for an overweight bag (more than 50 pounds) is $50. To avoid airport congestion, passengers can pay for baggage fees with a credit card online during the Web check-in process, or at the airport through an Alaska or Horizon check-in kiosk or customer service agent.

Unaccompanied minor and pet fees: The charge for transporting pets in the cabin is $100 one way. The fee for unaccompanied minors (children traveling alone) is $75 one way. Horizon Air prohibits pets from traveling as checked baggage during peak holiday travel between Nov. 23-29, and Dec. 21-Jan. 3, 2010.